Adding Docker build system & documentation

Dockerfile

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+FROM debian:jessie
+MAINTAINER Erik Dasque <erik@frenchguys.com>
+
+RUN apt-get update
+RUN apt-get install --no-install-recommends -y build-essential \
+    gcc \
+    unzip \
+    wget \
+    zip \
+    gcc-avr \
+    binutils-avr \
+    avr-libc \
+    dfu-programmer \
+    dfu-util \
+    gcc-arm-none-eabi \
+    binutils-arm-none-eabi \
+    libnewlib-arm-none-eabi \
+    git
+
+RUN apt-get clean
+RUN rm -rf /var/lib/apt/lists/*
+
+ENV keyboard=ergodox_ez
+ENV keymap=default
+
+VOLUME /qmk
+WORKDIR /qmk
+CMD make clean ; make keyboard=${keyboard} keymap=${keymap}